Cross bracing and bridging for metallic joists



Sept. 29 1931. w. F. ZABRISKIE 1,824,797

CROSS BRACING'AND BRIDGING FOR METALLIC J OISTS Filed March 5. 1929 Z'Sheets-Sheet 1 v ATTORNEYtS' Sept. 2Q, 1931. w. F. ZABRISKIE CROSS BRACING AND BRIDGING FOR METALLIC JOIS TS 2 Sheets-Sheet 2 Filed March 5, 1929 ATTORNEYS Patented Sept. 29, 1931 WILLIAM F; ZABRISKIE, or DETROIT; MIonreAn, .a'ssrelvonro GABRIEL screen, com

PANY, or DETROIT, Mica-teen, A- coaronnrion on rroHIeAn enossnneorne' Ann-BRIDGING roniranrnnmo Jo s'rs 1 .Application filed; Marcht, 192a. Serial-1'10, $44,450.-

It is the object. of the invention to provide a construction of cross bracing and bridging which may be easily applied, to various constructions of metallic floor. joists and to va- 5 rious'arrangements'of said joists in the floor construction. Tothis end the invention con.- .sists-in the construction as hereinafter set forth. Y v

3-; In the drawings: 1 a

1O F'gure l-is adiagrammaticplan view show ing. a portion of a. floor constructionhaving joists of varying lengths arranged adjacent to each other and showingthemeans of applying the cross bracing thereto; v

1 Figure 2 is a cross section-and Figure 3 a sideyelevation showing a col-istruction, of a permanently attached strut andi thebracing, bar in engagement therewith Figure 4 is a cross section illustrating one form of adjustable strut; g in Figure-5 is a-sectionalperspective view illustrating anotheriform Oil-BidjUStflblB strut; Figure 6 is across section showing the I-"g manner of bridging between'adjacent series of joists having separate cross bracing members,and

Figure 7 is a perspective view of the-bracket member shown in Figure 6; I v I 3 While my improved. cross bracing is 'apvplicable to various constructions; of metallic joists, I have illustrated specifically that type such as shown, in my prior Patents No. "1,622,559 of March 29, 1921-,- aiiid No'.'.--1, ZO4,235 1,5; of March- 5, 1929, in which the upper and 0 lower cord members are'formed of bars of structural shape. VVithsuch a construction,

it is possible to insert a strut member at, a convenient point in the length of the joist and b to provide this strut member" with means for longitudinally attaching thereto atransverselyextending bracing and bridging bar; 7 Thus where the lengths o fthe joi sts in a portion of the floor construction are substantially the at same, these struts in the successive joists will be insubstantial a l'i-gnment' with -eachother so that a single brace bar maybe'extend'ed to engage with each of the struts or the series. There are, however, floor constructions where '56 such an arrangement is not possible-for the reason thatethe, joists are of various lengths and therefore thestruts cannot be placed to line up with each other) without interference with other portions fot the joists. For such a condition I have provided means of attaching struts toth'efjoists after the layingof the same,,th us permitting ofaligningsaid struts to receive thecross bracing.

, with the construction illustrated Figures 2 and 3 the. joist is provided with a permanently, attached. strut andin which, A

represents a. bar "of structural; shape ,whiCh forms the upper cord member of the joist and Bis the strut bar. This strut is preferably formed of a channel bar having its:u1; pere nd 5 transversely:slitted a part way. through. and

bent to fol-man attachment flangeC which is welded to the web; ofthemember. A. Infa similarmanner the lower end of the strutlB is slitted and bent to form an attachment flange G which is welded to the lowercord member D of the joist, The portions of the bar adjacent to. the flanges ,Qand" C abut against the'cord members A and D and, thus thestrut in addition to its function, of a bracing connection constitutes a structural element of the joist H c E is a bracing bar adapted to extend transversely of a series of joists and tobe rig'idl attached to each of the struts thereof. The attachment between the struts and the braging bar is preferably formed by notchin g or cutting away a portionof the flanges of the channel bar'B'as indicated at F so as to receive the bar E. whichlatter is also preferably formed ofchannel cross section. The opposite ends F" F 'of the notch F are slightly tapered orbe'veled so that the bar E will have a 'wedge engagement therewithj The two membersare then clamped to'each other preferably by a U-bolt G which h s. itsllegs inserted through apertures Hf'in theweb of the bar B one end of said bolt terminating infahook G while the opposite end is thread ed for engagement with a nut G Thus when the parts are assembled and the nut' G is tightened the flangesof the bar will be forced into wedging engagement with the ends F F of the notch'F' so as to form a rot rigid connection between the strut and the bracing bar.

The construction just described is applitively different positions in order that they may line up with others in the series and furthermore it may be impossible to arrange the struts'in all of the joists in the same line. Thus as shown the struts for a portion of the series are'aligned to engage a brace bar E and the struts for another portion of the series are differently aligned for engagementwith a brace bar E To permit of so attaching the struts I have devised constructions as shown in Figures 4 and 5 provided with means means for adjustably clamping or attaching the ends of the struts to the upper and lower cord members of the joist. Figure 4 the strut bar B which isof channel cross section, is notched at J to fit over the lateral flange of the upper cord member A. The bar B also extends above the cord member A and is provided with a hooked bolt K passing through apertures in the flanges thereof a'nd having. a clamping nut K. The lower end of the bar B is provided with a similar hook bolt K but as the lower cord member is merely an angle bar having its lateral flange extending away from the strut, it is unnecessary to notch each strut. With such a construction the struts for a series of joists may be so placed in relation to each joist as to line up with each other and whereever it is impossible to extend the alignment through the entire series a portion of the joists may have their struts difierently aligned.

The construction shown in Figure 5 is particularly designed for usewhere a wooden floor is laid upon upper cord members of the joist. It isnecessary to provide means for nailing the floor to the joist and therefore each of the upper cord membersA which as .shown are formed of angle bars, has attached thereto a wooden nailing strip L.

With this construction the strut B may be clamped to the-lower cord member in the same manner as illustrated'in Figure 4, but

.to' attach the upper end of the strut to the upper cord member I preferably provide a gusset plate M. This .plate is welded to the upper portion of the bar Bland is arranged to overlap the side of the nailing strip ment with a brace bar.

L to which it may be attached by nails as indicated at N.

Where as illustrated in Figure 1 one brace bar E is clamped to a portion of a series of joists and another brace bar E differently aligned is'clamped to another portion of a series, it is necessary to provide a bracing and. bridging connection between the adjacent joists attached to the respective bars;

Thus. as shown the bar E overlaps the bar E between the adjacent joists I and I The construction may be such that it would be impossible to place strut bars in the same joist for attachment to each of the brace bars ,EE and I have therefore devised a construction of bracket attachable to the upper cord member of the joist and depending therefrom into position for clamping engage- Such a construction is illustrated in Figures 6 and 7 in which 0 is a-bar having a return bend at its upper end forming the eye member 0 and also clamping a bar P which extends transversely therefrom, terminating in the S-shaped bend P. These parts are preferably'rigidly attached to each otherby welding. At the lower end of the bar 0 is a return bend O which is proportioned to embrace the brace bar E and is also provided with a clamping bolt Q for rigidattachment to said bar. A hook bolt R is inserted through the eye 0 and is provided with a clamping nut R. In the construction as described the bracket is attached to a joist such as I which is next adjacent to a joist I having the last strut for engaging the brace bar E. It will be noted, however, that the brace bar E extends beyond the joist I overlapping the joist I" so that it can be clamped in the return bend O and thus rigidly attached. "It will alsobe obvious that when the bolt R is clamped by the nut B it will wedge the S-shaped end P of the bar Pbeneath the tapering flange of the upper cord member A of the joist which makes a rigid connection between the bracket and this member.

What I claim as my invention. is:

1. In a floor construction, the combination with a series of metallic joists, of a bracing and bridging connection therebetween comprising a strut rigidly attachedto each joist and formed of a bar of channel cross section, theflanges-of said bar being notched or cut away "at one point, a transversely extending bracing bar engaging the notches in: said flanges to interlock therewith and meansfor clamping said bracing bar to said strut.

2. In a floor construction, the combination with a series of metallic oists of a bracing and bridging connection therefor including struts attachable to the successive joists to be in transverse alignment with each other, a bracing bar extending along the series of struts and means for rigidly clamping said bracing bar to each strut of the series.

3. In a floor construction, the combination structural shape, and a clamp at the lower with a series of metallic joists of varying end of said bar for attachment to a bracing lengths, each joist comprising upper and bar.

lower cord members, of a transverse bracing for said joist, comprising struts adjustably attachable to the upper and lower cord members of each joist so as tobe in transverse alignment with each other in the successive joists, and a bracing bar rigidly clamped to each of said struts.

4:. In a floor construction, the combination with a metallic joist having upper and lower cord members, of a strut for attachment to a brace and bridging bar, said strut being formed of a bar of channel cross section, the flanges of said channel being notched or cut away at one point for the reception of a brace bar and tapered to form a wedging engagement therewith, and means for clamping the bracing bar to said strut to form a rigid lock therewith.

5. In a floor construction, the combination with a metallic joist having upper and lower cord members, of a strut extending between said upper and lower cord members and attached thereto, said strut being formed of a bar of channel cross section having the flanges thereof cut away at one point to form a notch for receiving the bracing bar, and a U-bolt for embracing the bracing bar engaging apertures in the web portion of said strut and provided with a clamping nut.

6. In a floor construction, the combination with a series of metallic joists having upper and lower cord members, said joists being of varying lengths, of a transverse bracing therefor comprising a plurality of bracingv bars for the joists of diiferent portions of the series, said bracing bars being out of alignment with each other, a strut for each joist arranged to align with the respective bracing bars and rigidly clamped thereto, and abrac ing and bridging connection between the two end joists of adjacent series comprising an extension to one of said bars to overlap the other of said bars, and a bracket attachable to the upper cord member of the joist and depending therefrom, being provided with clamping means for engaging the end of said overlapping bracing bar. a 7. In a floor construction, the combinatio with a metallic joist having upper and lower cord members, the upper cord member being of structural shape and having oppositely ex- 7 tending flanges, of a bracket attachable to said upper cord member comprising a bar having an eye at its upper end and a laterally extending memberattached thereto terminating in a transversely bent flange for engaging the under side of a flange of said structural shape, a hook bolt engaging said eye and hooking over the oppositely extending flangeof said structural shape, a clamping nut for said bolt adapted to wedge said laterally projecting member against the flange of said WILLIAM F. ZAB

RIKIE. 

